Soldering iron



FIG. 1 is a top, front and right-side perspective view of a soldering iron showing our new design;

FIG. 2 is a bottom, rear, and right-side perspective view;

FIG. 3 is a right-side elevational view, the opposite side being a mirror image thereof;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view;

FIG. 6 is a front elevational view; and,

FIG. 7 is a rear elevational view. 

The ornamental design for a soldering iron, as shown and described. 